Fukushima’s ice wall nearly complete
Wall is meant to stop water contamination at Japanese N-plant
Tokyo, Aug. 22: Fukushima’s operator on Tuesday started freezing the last section of a $320 million ice wall designed to combat widespread water contamination at the site of the worst nuclear accident in a generation.
Tokyo Electric Power (TEPCO) began pumping coolant into the remaining seven metres of its 1.5kilometre underground wall which encircles the four reactors along Japan’s northeast coast.
Underground pipes circulate the coolant and freeze soil around the buildings.
The 30-metre deep wall is designed to block underground water from nearby mountains from flowing into the shattered complex and then seeping into the Pacific.
It is reportedly expected to take more than two months until the wall is completely frozen.
The huge utility has been building the barrier since March 2016 with the government picking up its $320 million price tag.
Even now, with the ice wall almost complete, about 140 tonnes of underground water flows into the plant daily, forcing the company to pump it out and store it in on-site tanks.
“When the ice wall is completed, we estimate that the amount of underground water flowing into the complex will be less than 100 tonnes,” a company spokesman said.
But some experts have cast doubt on the ice wall, and the country’s Nuclear Regulation Authority said it has not yet done an independent analysis. “We doubt the ice wall is going to be as effective as TEPCO claims it will be,” said an NRA official.
“We’re going to monitor its progress after it is finished to check the impact.” In June, the NRA’s acting chief Toyoshi Fuketa publicly accused TEPCO of lying about the wall’s effectiveness. The same month, three former company executives went on trial, facing the only criminal charges laid in the accident. On March 11, 2011, a magnitude 9.0 undersea earthquake off Japan’s northeastern coast sparked a massive tsunami.
Fukushima’s operator started freezing the last section of a $320 million ice wall
The wall will combat widespread water contamination at the site
The wall is built to block underground water from nearby mountains
About 140 tonnes of underground water flows into the plant